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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 GBP (£) Y | Dec. 31, 2011 USD ($) Y | Dec. 31, 2012 USD ($) | Dec. 31, 2013 Subsequent Event GBP (£) | Dec. 31, 2013 Maximum Subsequent Event GBP (£)
Significant Accounting Policies [Line Items] |  |  |  |  |
Date of Incorporation | Jan. 11, 1991 |  |  |  |
Number of customer accounted for approximately 10% or more of total revenues | 2 | 0 |  |  |
Aggregate percentage of revenue the from customers accounted for more then 10% | 28.00% |  |  |  |
Temporary investments maturities | 90 days |  |  |  |
Deferred tax asset |  | $ 3,086,000 | $ 3,888,000 |  |
Operating loss carryforwards, limitations on use | Company's NOLs are subject to annual limitations of $1,300,000 |  |  |  |
Options and warrants excluded from the calculation of diluted shares | 0 | 1,995,000 |  |  |
Concentration risk, product, description | The reductions set forth in the proposed rule range from 11 to 47 percent from the levels established in the prior rule, for calendar years 2012, 2013, and 2014 |  |  |  |
Production and importation permission from government agency, amount | £ 55,000,000 |  |  | £ 39,000,000 | £ 45,000,000

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- Definition Description of risks that arise due to the volume of revenue generated by a particular product or other reliance placed on the success of that product, and the characteristics of that product that may give rise to the risk (for example, a patent or trademark expiration date). At a minimum, the description informs financial statement users of the general nature of the risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 21, 22, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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